JURGAITIS, Donatas. On simplification of first line partial derivatives equation system solution. Lietuvos matematikos rinkinys, [S. l.], v. 41, n. spec., p. 196–199, 2001. DOI: 10.15388/LMR.2001.34433. Disponível em: https://www.journals.vu.lt/LMR/article/view/34433.. Acesso em: 17 jul. 2024.